Drill sharpener, shaper, and gager.



O O O O O O O O PATENTED JAN. 2, 1906.

R, AND GAGE-Ru J. T. THOMPSON. DRILL SHARPENER, SHAPE APPLICATION FILEDMAYZ JAMES T. THOMPSON, OF TUOLUMNE, CALIFORNIA.

DRILL SHARPENER, SHAPER, AND GAGER.

Specification of Letters Patent.

Patented Jan. 2, 1906.

Application fil ed May 26, 1905. Serial No. 262,355.

To all whom it may concern.-

Be it known that I, JAMEs T. THOMPSON, a citizen of the United States,residing at Tuolumne, in the county of Tuolumne and State of California,have invented new and useful Improvements in Drill Sharpeners,- Shapers,and Gagers, of which the following is a specification.

My invention relates to machines for forming drill-bits of rock-drills.

The object of my-invention is to provide a simple, cheap, practicalmachine for upsetting, sharpening, shaping, and gaging drillbits in oneoperation and to protect the heated portion of the drill from oxidationand consequent flaking and waste. Usually it requires several differentoperations and several different machines or tools to do these things,and where the drill is more or less exposed to the air during suchoperations the drill tends not only to cool off rapidly, but to becomeoxidized on the surface and flake off. 4

The invention consists of the parts and the construction and combinationof parts, as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Figure 1 is a frontview of my apparatus. Fig. 2 is a side elevation of same. Fig. 3 is apian view of a die-section with cross-sections of same on lines WV W andX X. Fig. 4 is a section on line V V, Fig. 1. Fig. 5 is a plan View of adolly. Fig. 6 is an end view of a dolly.

A represents a swage-block of any'desired size and shape and mounted insuitable fashion, as on the frame 2. This block is of metal, usuallyquite heavy, and is so supported as to remain solid and immovable duringthe drill-sharpening operations. This swageblock has one or morehorizontallyextend ing tapered sockets, each or any of which is intendedto receive a sectional die, as 3. A die is preferably made intwo parts,adapted to embrace a drill-rod, the interior of the die being flared andshaped in cross-section corresponding to the desired flare andcrosssection of the finished drill-head.

4 is a tapered dolly conforming in shape to the flared die-recess andhaving its inner end provided with any desired form or number ofmatrices 4, depending on whether a rose bit, a cruciform bit, or anyother shape of bit is wanted. The dolly is fitted stopple-fashion intothe die and is held therein by suitable means, as the bar 5, having oneend hinged, as at 6, and the other adapted to be engaged in a suitablekeeper 7 when the bar is dropped down into position behind a dolly or anumber of dollies. The space included between the inner shaping end of adolly and the flared walls of the die constitutes the matrix for thedrill-head.

In operation a sectional die corresponding to the size and character ofthe drill to be sharpened is inserted into a recess in the swage-block.The drill-rod having its drilling end brought to a suitable temperatureis then passed from the front of the machine through the die, a dolly ofsuitable design inserted into the flared end of the die, and thelocking-bar closed down behind the dolly to hold the same in place andrigid against the blows which are delivered on the cold end of thedrill-rod projecting out from the other side of the machine. A suitableconcussive action is produced on the drill-rod to condense the heatedend of the same within the ma trix-chamber either by means of a steam orpneumatic hammer or by hand. The hammering on the end of the rod has theeffect of upsetting the hot and consequently soft pliant end of thedrill rod until it com-. pletely fills the space inclosed by the dollyand the die. As the dolly is machined to fit in the die, this space isinclosed so as to exclude the air, thereby maintaining the temperatureof the drill during the sharpening operation and protecting the heatedend from oxidation and consequent flaking. Moreover, since the die anddolly can be made to inclose a matrix-chamber of precisely the rightsize and shape of the finished drill, the entire operation of upsettingor condensing, shaping, sharpening, and gaging can be done at one andthe same time and by the same machine.

With cruciform drills the drill-shank is generally shapedcorrespondingly-that is, it is also in cross-section the shape of across. Consequently my die will be made to inclose a matrix-chambercorresponding thereto, as indicated in Fig. 3. For sharpening hollowdrills I may employ the die 3, and I may provide a central taperedmandrel or spreader projection 8 on the dolly, as shown in Fig. 4, whichspreader or mandrel is adapted to lie in axial alinement with the hollowdrill-rod and to protect the hollow of the drill against beingcontracted or closed up during the condensing or shaping operations.

By using a socket or swage-block A arranged With the socket horizontaland flared in the manner shown it is a simple matter to put in place ortake out the dies and the dollies even when the same are very hot.

The locking-bar operates to support the parts in position and takes theentire force of concussion. By having the dies removable in theswage-block the latter operates to conduct away excess heat from thedies, and so as to maintain the temper of the latter.

It is possible that various modifications in my invention may be madewithout departing from the principle thereof, and I do not Wish to beunderstood as limiting myself to the specific construction as hereinshown and described.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a drill sharpening apparatus, the combination of a swage-blockhaving a tapered die-recess, a removable sectional die fitting saidrecess, said die inclosing a tapered chamber corresponding to thedrillhead to be produced, a tapered dolly fitting and closing an end ofsaid chamber, and means for holding the dolly in position.

2. In a drill-sharpening apparatus, a suitably-supported swage-blockhaving a horizontal tapered die-recess, a correspondinglytaperedsectional die fitting said recess, said die inclosing a space contractedat one end corresponding with the shape and size of a drill-shank andspreading out at the other end corresponding with the head of thefinished drill, a tapered dolly fitting said die, and a locking-barv tohold said dolly in the die.

In testimony whereof I have hereunto set my hand in presence of twosubscribing Witnesses.

JAMES T. THOMPSON.

Witnesses D. W. LYON, W. J. SYMoNs.

